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Property acquisition (Details)
$ in Thousands
Dec. 07, 2017
USD ($)
Real Estate [Line Items]  
Transaction costs $ 19,600
Building [Member]  
Real Estate [Line Items]  
Transaction costs 10,800
Land [Member]  
Real Estate [Line Items]  
Transaction costs 8,800
Provident Bank [Member]  
Real Estate [Line Items]  
Remaining balance (inclusive of the transaction costs) $ 12,350
Station Place on Monmouth, LLC [Member]  
Real Estate [Line Items]  
Percentage of acquisition 100.00%
Acquisition costs $ 19,550
Transaction costs 550
Hammel Gardens Property [Member]  
Real Estate [Line Items]  
Net proceed from sales $ 7,000